Method and apparatus for controlling uplink transmission power in wireless communication system

ABSTRACT

A method, performed by a terminal, of transmitting and receiving a signal in a wireless communication system is provided. The method includes receiving a higher layer parameter for a physical uplink control channel (PUCCH), in response to the higher layer parameter including a cell identity (ID) indicating a serving cell, identifying an active downlink (DL) bandwidth part (BWP) of the serving cell, and receiving a reference signal (RS) on the active DL BWP of the serving cell.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application is a Continuation Application of U.S. Pat. No.10,681,645, scheduled to issue on Jun. 9, 2020, which claims priorityunder 35 U.S.C. § 119 to Korean Patent Application Serial No.10-2018-0002252, filed on Jan. 8, 2018, in the Korean IntellectualProperty Office, the entire disclosure of which is incorporated hereinby reference.

BACKGROUND 1. Field

The disclosure relates generally to wireless communication systems, andmore particularly, to a method and apparatus for controlling uplinktransmission power of a terminal in a wireless communication system.

2. Description of Related Art

To meet the demand for ever-increasing wireless data traffic sincecommercialization of the 4^(th)-generation (4G) communication system,there have been efforts to develop an advanced 5th generation (5G)system or pre-5G communication system. For this reason, the 5G or pre-5Gcommunication system is also called a beyond 4G network communicationsystem or post long term evolution (LTE) system. Implementation of the5G communication system using ultra-frequency (mmWave) bands (e.g., 60GHz bands) is considered to attain higher data rates. To reducepropagation loss of radio waves and increase a transmission range in theultra-frequency bands, beamforming, massive multiple-inputmultiple-output (MIMO), full dimensional MIMO (FD-MIMO), array antenna,analog beamforming, and large-scale antenna techniques are underdiscussion. To improve system networks, technologies for advanced smallcells, cloud radio access networks (RANs), ultra-dense networks, deviceto device (D2D) communication, wireless backhaul, moving networks,cooperative communication, coordinated multi-points (CoMP),reception-end interference cancellation, and the like are also beingdeveloped in the 5G communication system. In addition, in the 5G system,an advanced coding modulation (ACM) (e.g., hybrid FSK and QAM modulation(FQAM)), sliding window superposition coding (SWSC), and advanced accesstechnology (e.g., filter bank multi carrier (FBMC)), non-orthogonalmultiple access (NOMA), sparse code multiple access (SCMA) are beingdeveloped.

In the meantime, the Internet is evolving into an Internet of things(IoT) network where distributed entities such as things send, receiveand process information without human intervention. The Internet ofeverything (IoE) technologies combined with IoT, such as big dataprocessing technologies through connection with a cloud server, forexample, have also emerged. To implement IoT, various technologies, suchas sensing technology, wired/wireless communication and networkinfrastructure, service interfacing technology, and security technologyare required, and recently, even technologies for sensor network,machine to machine (M2M), and machine type communication (MTC) forconnection between things are being studied. Such an IoT environment mayprovide intelligent internet technology (IT) services that create a newvalue to human life by collecting and analyzing data generated amongconnected things.

IoT may be applied to a variety of areas, such as a smart home, a smartbuilding, a smart city, a smart car or connected car, a smart grid,health care, smart home appliances and advanced medical services throughconvergence and combination between existing IT and various industrialapplications.

In this regard, various attempts to apply the 5G communication system tothe IoT network are being made. For example, technologies regardingsensor network, M2M, MTC, etc., are implemented by the 5G communicationtechnologies, such as beamforming, MIMO, and array antenna schemes, etc.Even the application of a cloud RAN as the aforementioned big dataprocessing technology may be an example of convergence of 5G and IoTtechnologies.

With the development of the aforementioned technologies and wirelesscommunication systems, it is possible to provide various services, andthere is a need for a method to provide the services smoothly.

SUMMARY

The present disclosure has been made to address at least thedisadvantages described above and to provide at least the advantagesdescribed below.

In accordance with an aspect of the present disclosure, a method,performed by a terminal, of transmitting and receiving a signal in awireless communication system is provided. The method includes receivinga higher layer parameter for a physical uplink control channel (PUCCH),in response to the higher layer parameter including a cell identity (ID)indicating a serving cell, identifying an active downlink (DL) bandwidthpart (BWP) of the serving cell, and receiving a reference signal (RS) onthe active DL BWP of the serving cell.

In accordance with an aspect of the present disclosure, a method,performed by a base station (BS), of transmitting and receiving a signalin a wireless communication system is provided. The method includestransmitting a higher layer parameter including a cell ID indicating aserving cell, identifying an active DL BWP of the serving cell, andtransmitting a RS on the active DL BWP of the serving cell.

In accordance with an aspect of the present disclosure, a terminal fortransmitting and receiving a signal in a wireless communication systemis provided. The terminal includes a transceiver, and a processorcoupled with the transceiver. The processor is configured to receive ahigher layer parameter for a PUCCH, in response to the higher layerparameter including a cell ID indicating a serving cell, identify anactive DL BWP of the serving cell, and receive a RS on the active DL BWPof the serving cell.

In accordance with an aspect of the present disclosure, a BS fortransmitting and receiving a signal in a wireless communication systemis provided. The BS includes a transceiver and a processor coupled withthe transceiver. The processor is configured to transmit a higher layerparameter including a cell ID indicating a serving cell, identify anactive DL BWP of the serving cell, and transmit a RS on the active DLBWP of the serving cell.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features and advantages of certainembodiments of the disclosure will be more apparent from the followingdetailed description taken in conjunction with the accompanyingdrawings, in which:

FIG. 1 is a diagram of a time-frequency resource domain, according to anembodiment;

FIG. 2 is a diagram of a scalable frame structure for a 5G system,according to an embodiment;

FIG. 3 is a diagram of a scalable frame structure for a 5G system,according to an embodiment;

FIG. 4 is a diagram of a scalable frame structure for a 5G system,according to an embodiment;

FIG. 5 is a diagram of a process of transmitting an uplink data channel,according to an embodiment;

FIG. 6 is a diagram of a process for determining a power control statefunction, according to an embodiment;

FIG. 7 is a diagram of a process for determining a powercontrol statefunction, according to an embodiment;

FIG. 8 is a diagram of a procedure of setting parameter values forcontrolling transmission power of an uplink data channel in a basestation, according to an embodiment;

FIG. 9 is a diagram of a bandwidth part (BWP) structure established by abase station, according to an embodiment;

FIG. 10 is a diagram of a process for a terminal to calculate a pathloss value in a method for notifying a change of a reference signal,according to an embodiment;

FIG. 11 is a diagram of a process for a terminal to calculate a pathloss value in a method for notifying a change of a reference signal,according to an embodiment;

FIG. 12 is a diagram of a terminal, according to an embodiment; and

FIG. 13 is a diagram of a base station, according to an embodiment.

DETAILED DESCRIPTION

Embodiments of the disclosure will be described herein below withreference to the accompanying drawings. However, the embodiments of thedisclosure are not limited to the specific embodiments and should beconstrued as including all modifications, changes, equivalent devicesand methods, and/or alternative embodiments of the present disclosure.In the description of the drawings, similar reference numerals are usedfor similar elements.

The terms “have,” “may have,” “include,” and “may include” as usedherein indicate the presence of corresponding features (for example,elements such as numerical values, functions, operations, or parts), anddo not preclude the presence of additional features.

The terms “A or B,” “at least one of A or/and B,” or “one or more of Aor/and B” as used herein include all possible combinations of itemsenumerated with them. For example, “A or B,” “at least one of A and B,”or “at least one of A or B” means (1) including at least one A, (2)including at least one B, or (3) including both at least one A and atleast one B.

The terms such as “first” and “second” as used herein may usecorresponding components regardless of importance or an order and areused to distinguish a component from another without limiting thecomponents. These terms may be used for the purpose of distinguishingone element from another element. For example, a first user device and asecond user device indicates different user devices regardless of theorder or importance. For example, a first element may be referred to asa second element without departing from the scope the disclosure, andsimilarly, a second element may be referred to as a first element.

It will be understood that, when an element (for example, a firstelement) is “(operatively or communicatively) coupled with/to” or“connected to” another element (for example, a second element), theelement may be directly coupled with/to another element, and there maybe an intervening element (for example, a third element) between theelement and another element. To the contrary, it will be understoodthat, when an element (for example, a first element) is “directlycoupled with/to” or “directly connected to” another element (forexample, a second element), there is no intervening element (forexample, a third element) between the element and another element.

The expression “configured to (or set to)” as used herein may be usedinterchangeably with “suitable for,” “having the capacity to,” “designedto,” “adapted to,” “made to,” or “capable of” according to a context.The term “configured to (set to)” does not necessarily mean“specifically designed to” in a hardware level. Instead, the expression“apparatus configured to”, may mean that the apparatus is “capable of .. . ” along with other devices or parts in a certain context. Forexample, “a processor configured to (set to) perform A, B, and C” maymean a dedicated processor (e.g., an embedded processor) for performinga corresponding operation, or a generic-purpose processor (e.g., acentral processing unit (CPU) or an application processor (AP)) capableof performing a corresponding operation by executing one or moresoftware programs stored in a memory device.

The terms used in describing the various embodiments of the disclosureare for the purpose of describing particular embodiments and are notintended to limit the disclosure. As used herein, the singular forms areintended to include the plural forms as well, unless the context clearlyindicates otherwise. All of the terms used herein including technical orscientific terms have the same meanings as those generally understood byan ordinary skilled person in the related art unless they are definedotherwise. Terms defined in a generally used dictionary should beinterpreted as having the same or similar meanings as the contextualmeanings of the relevant technology and should not be interpreted ashaving ideal or exaggerated meanings unless they are clearly definedherein, According to circumstances, even the terms defined in thisdisclosure should not be interpreted as excluding the embodiments of thedisclosure.

The term “module” as used herein may, for example, mean a unit includingone of hardware, software, and firmware or a combination of two or moreof them. The “module” may be interchangeably used with, for example, theterm “unit”, “logic”, “logical block”, “component”, or “circuit”. The“module” may be a minimum unit of an integrated component element or apart thereof. The “module” may be a minimum unit for performing one ormore functions or a part thereof. The “module” may be mechanically orelectronically implemented. For example, the “module” according to thedisclosure may include at least one of an application-specificintegrated circuit (ASIC) chip, a field-programmable gate array (FPGA),and a programmable-logic device for performing operations which has beenknown or are to be developed hereinafter.

An electronic device according to the disclosure may include at leastone of, for example, a smart phone, a tablet personal computer (PC), amobile phone, a video phone, an electronic book reader (e-book reader),a desktop PC, a laptop PC, a netbook computer, a workstation, a server,a personal digital assistant (PDA), a portable multimedia player (PMP),a MPEG-1 audio layer-3 (MP3) player, a mobile medical device, a camera,and a wearable device. The wearable device may include at least one ofan accessory type (e.g., a watch, a ring, a bracelet, an anklet, anecklace, a glasses, a contact lens, or a head-mounted device (HMD)), afabric or clothing integrated type (e.g., an electronic clothing), abody-mounted type (e.g., a skin pad, or tattoo), and a bio-implantabletype (e.g., an implantable circuit).

The electronic device may be a home appliance. The home appliance mayinclude at least one of, for example, a television, a digital video disk(DVD) player, an audio, a refrigerator, an air conditioner, a vacuumcleaner, an oven, a microwave oven, a washing machine, an air cleaner, aset-top box, a home automation control panel, a security control panel,a TV box (e.g., Samsung HomeSync™, Apple TV™, or Google TV™), gameconsole (e.g., Xbox™ and PlayStation™), an electronic dictionary, anelectronic key, a camcorder, and an electronic photo frame.

The electronic device may include at least one of various medicaldevices (e.g., various portable medical measuring devices (a bloodglucose monitoring device, a heart rate monitoring device, a bloodpressure measuring device, a body temperature measuring device, etc.), amagnetic resonance angiography (MRA), a magnetic resonance imaging(MRI), a computed tomography (CT) machine, and an ultrasonic machine), anavigation device, a global positioning system (GPS) receiver, an eventdata recorder (EDR), a flight data recorder (FDR), a vehicleinfotainment device, an electronic device for a ship (e.g., a navigationdevice for a ship, and a gyro-compass), avionics, security devices, anautomotive head unit, a robot for home or industry, an automatic tellermachine (ATM) in banks, point of sales (POS) devices in a shop, or anIoT device (e.g., a light bulb, various sensors, electric or gas meter,a sprinkler device, a fire alarm, a thermostat, a streetlamp, a toaster,a sporting goods, a hot water tank, a heater, a boiler, etc.).

The electronic device may include at least one of a part of furniture ora building/structure, an electronic board, an electronic signaturereceiving device, a projector, and various kinds of measuringinstruments (e.g., a water meter, an electric meter, a gas meter, and aradio wave meter). The electronic device may be a combination of one ormore of the aforementioned various devices. The electronic device mayalso be a flexible device. Further, the electronic device is not limitedto the aforementioned devices, and may include an electronic deviceaccording to the development of new technology.

Hereinafter, an electronic device will be described with reference tothe accompanying drawings. In the disclosure, the term “user” indicatesa person using an electronic device or a device (e.g., an artificialintelligence electronic device) using an electronic device.

In the following description, a base station is an entity for performingresource allocation for a terminal, and may be at least one of Node B,BSs, eNode s (eNs), gNode B (gNB), radio access unit, base stationcontroller, or network node. A terminal may include user equipment (UE),a mobile station (MS), a cellular phone, a smart phone, a computer, or amultimedia system capable of performing communication. Embodiments ofthe present disclosure will also be applied to other communicationsystems with similar technical backgrounds or channel types to theembodiments of the present disclosure. Furthermore, embodiments of thepresent disclosure will also be applied to other communication systemsthrough some modifications to an extent that does not significantlydeviate the scope of the present disclosure as determined by skilledpeople in the art.

To handle explosive mobile data traffic, the 5G system or new radio (NR)access technology, which is the next generation communication systemafter the long term evolution (LTE) or evolved universal terrestrialradio access (E-UTRA) and LTE-Advanced (LTE-A) or E-UTRA evolution isdiscussed actively these days. While the existing mobile communicationsystem has focused on typical voice/data communication, the 5G systemaims to meet various services and demands, such as enhanced mobilebroadband (eMBB) services to improve the existing voice/datacommunication, ultra-reliable and low latency communication (URLLC)services, massive MTC services, etc.

The 5G system is mainly designed for data services of ultra high speedup to several Gbps using ultra wide bandwidth that is much wider than inthe existing LTE and LTE-A system that has a maximum of 20 MHz of systemtransmission bandwidth for a single carrier. Accordingly, the 5G systemconsiders the ultra high frequency band from several GHz to a maximum of100 GHz, from which it is relatively easy to secure the ultra widebandwidth frequency as a candidate frequency band. In addition, itconsiders securing a wide bandwidth frequency for the 5G system throughfrequency relocation or allocation among the frequency band ranging fromhundreds of MHz to several GHz used in the existing mobile communicationsystem.

When a base station supports the wide bandwidth frequency, a bandwidthpart (BWP) technique which divides the entire carrier frequency bandinto multiple frequency bands, each of which the base station maysupport for each terminal, is becoming more important. Specifically, inthe case that the base station supports the BWP, when a terminal has lowBW capability, the base station may support a small frequency bandwidthto the terminal through the BWP and reduce energy consumption of theterminal by reducing the frequency bandwidth through a change of BWP.Besides, it gives an advantage of providing a terminal with variousservices without latency by changing the BWP while providing a differentframe structure for each BWP. The BWP technology may be applied to acontrol channel or data channel corresponding one to one between acertain terminal and the base station. It may also be applied even for acontrol channel and data channel, on which the base station transmitscommon signals (e.g., synchronization signal, physical broadcast channel(PBCH), and/or system information) to multiple terminals in the system,to help the base station save energy by transmitting the signals in anestablished BWP.

As another demand for the 5G system, ultra-low latency services arerequired whose transmission latency is 1 ms or so between transmittingand receiving ends. As a solution for reducing the transmission latency,there is a need to design a frame structure based on short transmissiontime interval (TTI) as compared with that of LTE and LTE-A. A TTI is abasic time unit in performing scheduling, and the TTI for the existingLTE and LTE-A is 1 ms, which corresponds to the length of one subframe.For example, the short TTI to meet the requirement for the ultra-lowlatency service of the 5G system may be about 0.5 ms, 0.2 ms, 0.1 ms,etc., which is shorter than that of the existing LTE and LTE-A system. Aframe structure of the LTE and LTE-A systems will now be described withreference to the accompanying drawings, and design guidelines for the 5Gsystem will be described next.

FIG. 1 is a diagram of a time-frequency resource domain, which is aradio resource domain where data or a control channel is transmitted inLTE and LTE-A systems, according to an embodiment.

Referring to FIG. 1, the horizontal axis of the time-frequency resourcedomain indicates the time domain, and the vertical axis indicates thefrequency domain. Throughout the specification, a radio link in which aterminal transmits data or a control signal to a base station is calleduplink (UL) and a radio link in which a base station transmits data or acontrol signal to a terminal is called downlink (DL).

The smallest transmission unit in the time domain of the existing LTEand LTE-A systems is an orthogonal frequency division multiplexing(OFDM) symbol for DL and a single carrier-frequency division multipleaccess (SC-FDMA) symbol for UL. Nsymb symbols 102 may constitute oneslot 106. Two slots may constitute one subframe 105. The slot is 0.5 mslong, and the subframe is 1.0 ms long, A radio frame 114 is a timedomain unit including ten subframes. In the frequency domain, thesmallest transmission unit is a 15 k Hz unit of subcarrier (subcarrierspacing=15 kHz), and the bandwidth of the overall system transmissionband may have a total of N_(BW) subcarriers 104. The basic resource unitin the time-frequency domain is a resource element (RE) 112, which maybe represented with at least one of OFDM symbol or SC-FDMA symbol indexand subcarrier index. A resource block (RB) 108 or physical resourceblock (PRB) may be defined with consecutive Nsymb OFDM symbols 102 orSC-FDMA symbols in the time domain and consecutive N_(RB) subcarriers110 in the frequency domain. Accordingly, one RB 108 may includeNsymb×N_(RB) REs (112). In the LTE and LTE-A systems, data is mapped inRB units, and the base station may perform scheduling in RB-pair unitsthat constitute one subframe for a certain terminal. The number ofSC-FDMA symbols or OFDM symbols, Nsymb, is defined by the length ofcyclic prefix (CP) added to each symbol to avoid inter-symbolinterference. For example, for the normal CP, Nsymb=7, and for theextended CP, Nsymb=6. The extended CP is used in a system with arelatively long radio transmission range than of the normal CP tomaintain orthogonality between symbols.

Subcarrier spacing, CP length, etc., are essential information for OFDMtransmission and reception, so that the base station and the terminalneed to recognize them as common values to perform smooth transmissionand reception.

N_(BW) and N_(RB) are proportional to the bandwidth of the systemtransmission band. Data rate increases in proportion to the number ofRBs scheduled for the terminal.

The aforementioned frame structure of the LTE and LTE-A systems isdesigned for typical voice/data communication and has limitations onscalability to meet various services and requirements as in the 5Gsystem. Accordingly, considering various services and requirements, theframe structure for the 5G system needs to be dynamically defined andoperated.

FIGS. 2 to 4 are diagrams of scalable frame structures for the 5Gsystem, according to an embodiment.

It is assumed that subcarrier spacing, CP length, and slot length are aset of required parameters to define a scalable frame structure in FIGS.2 to 4. Although the basic time unit for scheduling in the 5G system isa slot, it is only by way of example and may be adjusted according topreferences.

In the early days of the introduction of the 5G system, the 5G systemand the existing LTE/LTE-A system are expected to coexist or operate indual mode. This allows the existing LTE/LTE-A systems to perform stablesystem operation and 5G systems to provide enhanced services.Accordingly, the scalable frame structure for the 5G system needs toinclude at least the frame structure or required parameter set for theLTE/LTE-A.

In FIG. 2, the frame structure or required parameter set of the 5Gsystem, which is the same as those of the LTE/LTE-A, is shown, Referringto FIG. 2, subcarrier spacing in a type A frame structure may be 15 kHz,14 symbols may constitute a 1 ms slot, and 12 subcarriers, 12×15 kHz=180kHz, may constitute a PRB.

FIG. 3 shows a type B frame structure. Referring to FIG. 3, subcarrierspacing in the type B frame structure may be 30 kHz, 14 symbols mayconstitute a 0.5 ms slot, and 12 subcarriers, 12×30 kHz=360 kHz, mayconstitute a PRB. The type B frame structure is two times larger in thesubcarrier spacing and the PRB size and two times smaller in the slotlength and the symbol length than the type A frame structure.

FIG. 4 shows a type C frame structure. Referring to FIG. 4, subcarrierspacing in the type C frame structure may be 60 kHz, 14 symbols mayconstitute a 0.25 ms slot, and 12 subcarriers, 12×60 kHz=720 kHz, mayconstitute a PRB. The type C frame structure is four times larger in thesubcarrier spacing and the PRB size and four times smaller in the slotlength and the symbol length than the type A frame structure.

In light of generalization of the types of frame structure of FIGS. 2 to4, the 5G system may provide high scalability by determining thesubcarrier spacing, CP length, and slot length, which are the set ofrequired parameters, to have integer multiple relationships for eachtype of frame structure.

Furthermore, a subframe having a fixed length of 1 ms may be defined soas to represent a reference time unit regardless of the type of framestructure. Accordingly, the type A frame structure has a subframecomposed of one slot, type B has a subframe composed of two slots, andtype C has a subframe composed of four slots.

The aforementioned types of frame structure may be applied to correspondto various scenarios. From the perspective of the cell size, since thelonger the CP, the larger cell may be supported, the type A framestructure may support a relatively large cell as compared with types Band C of frame structure. From the perspective of an operating frequencyband, since the larger the subcarrier spacing, the better the highfrequency band is recovered from phase noise, the type C frame structuremay support a relatively high operation frequency as compared with typesA and B frame structures. From the perspective of services, it isbeneficial to have a shorter slot length, which is the basic time unitof scheduling, to support an ultra low latency service, so the type Cframe structure may be relatively suitable to the URLLC service ascompared with types A and B frame structures.

In addition, several types of frame structure may be multiplexed by BWPtechnology in a single system and operated in an integrated manner.

In an initial access stage for a terminal to access the system for thefirst time, the terminal may first make synchronization in the downlinktime and frequency domain based on a sync signal through cell search andobtain a cell ID. The sync signal may include a primary synchronizationsignal (PSS) and a secondary synchronization signal (SSS). The terminalmay further obtain system information and basic parameter values relatedto transmission and reception, such as system bandwidth or associatedcontrol information by receiving a PBCH from the base station. The syncsignal may serve as a reference for cell search. Each frequency bandemploys subcarrier spacing that fits the channel condition such as phasenoise. For the data channel or control channel to support variousservices as described above, different subcarrier spacing may be appliedfor each service type. The terminal may then switch the link with thebase station into a connected state by performing a random accessprocess, and send data to the base station on a physical uplink sharedchannel (PUSCH).

FIG. 5 is a diagram of a process of transmitting an uplink data channel,according to an embodiment.

The process of transmitting an uplink data channel will now be describedin detail in connection with FIG. 5. Referring to FIG. 5, in step 501 ofthe process of sending uplink data channel, a base station, gNB, mayperiodically send an SS block including a sync signal and a PBCH (i.e.,synchronization signal block (SSB) to multiple terminals, UEs,) in thesystem. A terminal may then synchronize time/frequency based on the syncsignal and may receive required system information required fortransmission and reception of the data channel and control channel ofthe terminal on the PBCH. The terminal may also measure a value of pathloss between the base station and the terminal through the SSS in orderto determine uplink data transmission power.

In step 502, the base station may send an uplink schedule grant to theterminal on a physical downlink control channel (PDCCH). It may send anuplink resource to be used by the terminal, transmission timing of theuplink data channel, transmission power control (TPC) command, etc.,through the uplink scheduling grant including scheduling information.The scheduling information may include control information of an uplinkBWP for the terminal.

In step 503, the terminal may use the uplink resource allocated in step502 to send uplink data to the base station on the PUSCH. Transmissiontiming on the uplink data channel to send the uplink data may follow thetiming control command received from the base station in step 502.Transmission power of the uplink data channel to send the uplink datamay be determined by taking into account the value of the path lossmeasured by the terminal in step 501 and the power control commandreceived from the base station in step 502.

As described above, the transmission power of the uplink data channel tosend the uplink data may be determined by the terminal taking intoaccount the value of the path loss measured by the terminal and thepower control command from the base station. When the terminal supportsBWP, the terminal may prevent unnecessary power consumption of theterminal and minimize uplink interference by optimizing the transmissionpower of the uplink data channel to send the uplink data when the BWP ischanged according to determination of the base station based on theexisting uplink BWP channel condition or traffic.

Transmission power of an uplink control channel to send uplink controlinformation may be determined in the similar manner to the followingmethod. Transmission timing of the uplink control channel, TPC command,etc., of the uplink control channel is sent on a downlink controlchannel of the base station. Based on the aforementioned information,the transmission power for the PUCCH including ACK/NACK information mayalso be determined in the same manner.

First Embodiment

A method for the terminal to set and send transmission power of theuplink data channel will be described in a case where the terminal sendsuplink data on the PUSCH in response to the value of the path loss thatthe terminal measures from the SS block in the data channel transmissionprocess and a power control command received from the base station.Referring to Equation (1), in slot i, along with parameter setestablishment index j and power control state function index l of theuplink data channel, uplink data channel transmission power P_(PUSCH)may be determined as in the following Equation (1), which is representedin dBm units. In Equation (1), when the terminal supports a plurality ofcarrier frequencies in a plurality of cells, each parameter may bedetermined for each cell c and carrier frequency f and distinguished byindex c and f.P _(PUSCH,ƒ,c)(i,j,q _(d) ,l)=min{P _(CMAX,ƒ,c)(i),Parameter set A+α_(ƒ,c)(j)·PL _(ƒ,c)(q _(d))+ƒ_(ƒ,c)(i,l)}[dBm]  (1)

1) P_(CMAX,ƒ,c) maximum transmission power allowed for the terminal,which is defined by power class and higher layer signaling settings ofthe terminal.

2) α_(ƒ,c)(j) a value for partially compensating for the path loss,pathloss, between the base station and the terminal, 0≤α_(ƒ,c)(j)≤1

3) PL_(ƒ,c)(q_(d)) path loss between the base station and the terminal,the terminal calculating the path loss from a difference betweentransmission power for a reference signal (RS) resource q_(d) signaledby the base station and a received signal level of the RS at theterminal. The index q^(d) determines whether the calculation of the pathloss is based on the SS block, the CSI-RS, or both.

4) ƒ_(ƒ,c)(i,l) the l^(th) power control state function calculated inresponse to a power control command included in the base stationscheduling information for the slot i. The number of power control statefunctions is notified through higher layer signaling. The terminal maycalculate ƒ_(ƒ,c)(i,l) for uplink data transmission in the followingmethod.

5) Parameter set A a value set and signaled by the base station to theterminal to compensate for uplink interference, the value including atleast some of the following details:

A. M_(RB,ƒ,c) ^(PUSCH)(i) the number of PRBs, which is an amount offrequency resource scheduled by the base station for the slot I;

B. μ a subcarrier spacing configuration value;

C. P₀ _(PUSCH,ƒ,c) (j) an amount of interference measured and signaledby the base station to the terminal, where index j is determineddepending on the type of date, e.g., j=0 in the case of uplink datatransmission of the terminal in a random access process, j=1 forsemi-persistent scheduling data having grant-free data or schedulinginformation that remains unchanged for a certain period of time, and j=2for dynamically scheduled data; and

D. Δ_(TF,ƒ,c)(i) Equation (1) may be developed into Equation (2) byreflecting details of power offset parameter set A according to atransport format (TF) or modulation and coding scheme (MCS) of datascheduled by the base station for the slot i.

$\begin{matrix}{{P_{{PUSCH},f,c}\left( {i,j,q_{d},l} \right)} = {\min{\begin{Bmatrix}{P_{{CMAX},f,c}(i)} \\{{10\;{\log_{10}\left( {2^{\mu} \cdot {M_{{RE},f,c}^{PUSCH}(i)}} \right)}} + {P_{{0{\_{PUSCH}}},f,c}(j)} + {{\alpha_{f,c}(j)} \cdot {{PL}_{f,c}\left( q_{d} \right)}} + {\Delta_{{TF},f,c}(i)} + {f_{f,c}\left( {i,l} \right)}}\end{Bmatrix}\mspace{14mu}\lbrack{dBm}\rbrack}}} & (2)\end{matrix}$

When the terminal supports BWP, when the BWP of uplink data channel ischanged, a method for determining a power control state functionƒ_(ƒ,c)(i,l) to determine uplink data transmission power of the terminalmay be defined as follows. The base station may notify the terminal ofthe changed BWP through higher layer signaling or physical layersignaling.

In a first method for determining a power control state function,regardless of whether an uplink BWP previously used and a BWP for theuplink data channel to send uplink data are changed, a power controlstate function may be determined in such a method that the terminalaccumulates it to the previous power control state function at all thepower control commands included in the PDCCH. This is expressed as inEquation (3):ƒ_(ƒ,c)(i,l)=ƒ_(ƒ,c)(i−1,l)+δ_(PUSCH,ƒ,c)(i−K _(PUSCH) ,l)  (3)

where ƒ_(ƒ,c)(i−1,l) a power control state function value for previousslot i−1;

K_(PUSCH) a slot location where the downlink control channel includingthe power control command and the uplink scheduling grant is sent. Avalue of K_(PUSCH) is determined according to transmission timinginformation of the uplink data channel included in the downlink controlchannel; and

δ_(PUSCH,ƒ,c)(i−K _(PUSCH) ,l) a correction value that is changed by aTPC command included in the downlink control channel received in a slotbefore K_(PUSCH).

The first method for determining a power control state function issuitable to an occasion when there is a small difference under a channelcondition between existing and changed uplink BWPs. In other words, in acase that the conditions between the existing and changed uplink BWPsare similar, even when there is a change in BWP, the power control statefunction may be determined based on the previously calculated powercontrol state function.

FIG. 6 is a diagram of a process for determining a power control statefunction, according to an embodiment. Referring to FIG. 6, at t1,transmission may be made from the terminal to the base station attransmission power P1 obtained by adding power control state functionƒ_(ƒ,c)(t₁), where ƒ_(ƒ,c)(t₁)=0 in FIG. 6) to a combination of power P0(BWP1) and power PL (BWP1) for BWP1. At t2, transmission may be madefrom the terminal to the base station at power P2 obtained by addingpower control state function value ƒ_(ƒ,c)(t₂) which is changed byδ_(PDSCH,c′) from ƒ_(ƒ,c)(t₁), to the unchanged combination of P0 (BWP1)and PL (BWP1). Similarly, at t3 and t4, transmission may be made fromthe terminal to the base station at power P3 and P4, respectively,obtained by adding accumulated power control state function valuesƒ_(ƒ,c)(t₃) and ƒ_(ƒ,c)(t₄), respectively, to the combination of P0(BW1) and PL (BWP1) until the BWP (BWP1) is changed. When the uplink BWPis changed, at t5, transmission is made at power P5 obtained by addingpower control state function ƒ_(ƒ,c)(t₅), which is changed byδ_(PDSCH,c′) from the power control state function value ƒ_(ƒ,c)(t₄)calculated at t4, to a combination of power P0 (PWP2) and power PL(BWP2) for BWP2. In FIG. 6, the BWP that the terminal uses at t5corresponds to BWP2, which is different from BWP1 that the terminal usesat t4. That is, even when the BWP is changed, the power control statefunction is calculated by just being accumulated. Even when the BWP usedby the terminal is changed again, the transmission power may bedetermined based on the power control state function value right beforethe change.

In a second method for determining a power control state function, whenthe BWP is changed, the terminal initializes calculation of the powercontrol state function, and otherwise the BWP is unchanged, the powercontrol state function may be calculated in the first method fordetermining a power control state function. When the BWP is changed, theexisting power control state function may be initialized. For example,after the previous power control state function ƒ_(ƒ,c)(i−1) isinitialized to 0 in Equation (3), the next power control state functionmay be calculated. The second method for determining a power controlstate function is suitable to an occasion when there is a largedifference under a channel condition between existing and changed uplinkBWPs.

FIG. 7 is a diagram of a process for determining a power control statefunction, according to an embodiment. Referring to FIG. 7, at t1,transmission may be made from the terminal to the base station attransmission power P1 obtained by adding the power control statefunction ƒ_(ƒ,c)(t₁) to a combination of power P0 (BWP1) and power PL(BWP1) for BWP1. When the BWP is changed before transmission of the nextuplink data, the terminal may initialize ƒ_(ƒ,c)(t₁) to 0 at t2,calculate the next power control state function ƒ_(ƒ,c)(t₂) and maketransmission to the base station at P2 obtained by adding the powercontrol state function to a combination of P0 (BWP2) and PL (PWP2) forBWP2. When the BWP used by the terminal is changed again, calculation ismade after the power control state function is initialized to 0.

In a third method for determining a power control state function, thebase station may determine whether to initialize or just accumulate theprevious power control state function and notify the terminal of thedetermination. This is expressed as in Equation (4):ƒ_(ƒ,c)(t ₁)=γ·ƒ_(ƒ,c)(i−1,l)+δ_(PSDCH,ƒ,c)(i−K _(PUSCH) ,l)  (4)

where γ is a weighting factor to control the power control statefunction to be reflected in the transmission power of uplink data, whichmay be notified by the base station to the terminal in systeminformation or on a downlink control channel. For example, for γ=1, itis the same as in the first method for determining a power control statefunction, and for γ=0, it is the same as in the second method fordetermining a power control state function. The base station may notifya value to be applied to the terminal through signaling.

FIG. 8 is a diagram of a procedure of setting parameter values forcontrolling transmission power of an uplink data channel in a BS,according to an embodiment.

At step 801, the base station establishes a BWP environment to be usedby the terminal. The BWP environment may include information about abandwidth of the BWP, a frequency domain location of the BWP, subcarrierspacing to be applied to the BWP, etc. The established BWP environmentmay be notified to the terminal through RRC signaling. According to theestablished BWP environment, parameter values included in Parameter setA of Equation (1) may be set.

At step 802, the base station activates/deactivates particular BWPs tobe used by the terminal in the established BWP environment. Theactivated/deactivated BWP may be notified to the terminal through higherlayer signaling or physical layer signaling on the downlink controlchannel.

At step 803, the base station determines whether the existing BWP isidentical to a new BWP.

When the BWP is not changed, a value of ƒ_(ƒ,c)(i) is determinedaccording to the first method for determining a power control statefunction at step 804. When the BWP is changed, a value of ƒ_(ƒ,c)(i) isdetermined according to predetermined one of the first, second, or thirdmethods of determining a power control state function at step 805.Parameter values included in Parameter set A set according to thechanged BWP and a power control command value corresponding to the valueof ƒ_(ƒ,c)(i) may be sent to the terminal.

The methods for determining a power control state function may beapplied even in a situation in which the carrier frequency of the uplinkdata channel is changed. Specifically, when the carrier frequency of theuplink data channel is changed from ƒ₁ to ƒ₂, a method for determining apower control state function from ƒ_(ƒ) ₁ _(,c)(i) to ƒ_(ƒ) ₂ _(,c)(i)may be applied to determine uplink data transmission power of theterminal.

Table 1 represents an example of corrected values δ_(PDSCH,c) changedaccording to the power control command included in the base stationscheduling information. For example, when the base station intends toincrease the uplink data transmission power of the terminal by 3 dB, itmay send a power control command of “3” to the terminal in the basestation scheduling information.

TABLE 1 TPC Command Field in DCI format X Accumulated δ_(PUSCH, c) (dB 0−1 1 0 2 1 3 3

Second Embodiment

A method for the BS to notify the terminal of an RS to be subjected topath loss measurement will be described. An RS includes an SS block, aCSI-RS, etc.

The path loss between the base station and the terminal is an indicationto show whether the channel condition is good or bad. The greater thepath loss, the worse the channel condition and the less the amount ofchange over time. To overcome a bad channel condition caused by largepath loss, the terminal needs to set relatively high transmission powerfor a signal for transmission and send the signal at the power. When theterminal supports a plurality of carrier frequencies in a plurality ofcells, each parameter may be calculated for each cell c and carrierfrequency f. The path loss PL_(ƒ,c) included in Equation (1) may becalculated from an RS received by the terminal from the base station inEquation (5):PL _(ƒ,c)=referenceSignalPower−RSRP  (5)where ‘referenceSignalPower’ denotes base station transmission power ofan RS notified by the base station to the terminal in the systeminformation (SI), and ‘reference signal received power (RSRP)’ denotes areceived signal strength of the RS received and measured by theterminal.

In the case of a terminal that supports the BWP, when the uplink ordownlink BWP is changed, channel conditions of the RS sent in thedownlink BWP and the uplink BWP are different, so the difference of thepath losses may be large as the uplink and downlink frequency bandwidthsare changed. Accordingly, for the terminal to accurately measure thepath loss, the RS to be received from the base station needs to bechanged. A method for the base station to notify the terminal of achange in RS from which to measure the path loss will be described asfollows. The base station may notify the terminal whether there is achange in BWP.

In a first method for notifying a change in RS, the base station maysend information to the terminal in two steps to notify an RS from whichto calculate a path loss. The base station may designate a cell in afirst step and designate a BWP established for the cell and notify theterminal of the BWP in a second step. Based on the two pieces ofinformation, the terminal may receive an RS sent from the base stationin a particular BWP of a particular cell and measure RSRP. From the RSRPmeasured and SI related to the designated BWP additionally received bythe terminal, the terminal may detect base station transmission power ofthe RS and calculate the path loss. The first method for notifying achange in RS is suitable to an environment in which the base stationnotifies the terminal of all the established BWP formats. In theenvironment, a change in RS may be notified to the terminal through alittle extra signaling. The base station may inform the terminal of allthe established BWP formats through higher layer signaling. In otherwords, with designation of a cell and a BWP in the cell, the terminalmay be able to receive an RS in the downlink BWP and associated SI andmeasure a path loss.

FIG. 9 is a diagram of a bandwidth part (BWP) structure established by abase station, according to an embodiment. In the situation where thedownlink BWP is established as shown in FIG. 9, in order for the basestation to designate a reference BWP for the terminal to measure anuplink path loss, the base station first designates a cell (one of 901,904, 907, and 910) and then designates a BWP in the designated cell. Forexample, the base station may designate BWP1 905 or BWP2 906 once thecell 904 is designated.

In a second method for notifying a change in RS, as in the first methodfor notifying a change in RS, the base station may designate a cell anda BWP in the cell in two steps for the terminal and may then notify theterminal of them along with RS transmission power ‘referenceSignalPower’of the designated BWP. The second method for notifying a change in RSmay allow the terminal to receive the BWP-related SI and measure a pathloss without an extra process.

In a third method for notifying a change in RS, the base station maydesignate an RS of a particular frequency bandwidth directly for theterminal and notify the terminal of the change in RS. The terminal mayreceive the particular RS and measure RSRP. From the RSRP measured andSI signaling related to the designated RS additionally received by theterminal, the terminal may figure out the base station transmissionpower of the RS and calculate the path loss. The third method fornotifying a change in RS is suitable to an environment in which the basestation notifies not all the established BWP formats to the terminal. Inthe environment, the base station may notify a frequency bandwidth of aparticular RS for the terminal to receive the RS in the downlinkfrequency bandwidth and associated SI and measure a path loss.

In a fourth method for notifying a change in RS, as in the third methodfor notifying a change in RS, the base station may designate an RS of aparticular frequency bandwidth directly for the terminal and notify theterminal of the RS along with reference signal transmission power‘referenceSignalPower’ of the designated RS. Similar to the secondmethod for notifying a change in RS, the fourth method for notifying achange in RS may allow the terminal to receive the BWP-related SI andmeasure a path loss without an extra process.

FIG. 10 is a diagram of a process for a terminal to calculate a pathloss value in a method for notifying a change in RS, according to anembodiment.

Referring to FIG. 10, a process for a terminal to calculate a path losswith a change in BWP in the first and third methods for notifying achange in RS will be described.

At step 1001, the terminal is notified of information about a change ofBWP and associated RS from the base station. The notification may bemade to the terminal through higher layer signaling.

At step 1002, the terminal receives a designated RS, measures RSRP, anddetects reference signal power, referenceSignalPower, from SI of thedesignated RS.

At step 1003, the terminal calculates a path loss based on the detectedreferenceSignalPower and the measured RSRP in Equation (5).

FIG. 11 is a diagram of a process for a terminal to calculate a pathloss value in a method of notifying a change in RS, according to anotherembodiment.

Referring to FIG. 11, a process for a terminal to calculate a path losswith a change in BWP in the second and fourth methods for notifying achange in RS will be described.

At step 1101, the terminal is notified of information about a change inBWP and associated RS, and referenceSignalPower of the changed RS fromthe base station.

At step 1102, the terminal receives the designated RS and measures RSRP.

Finally, at step 1103, the terminal calculates a path loss based on thenotified referenceSignalPower and the measured RSRP in Equation (5).

The most common method for the base station to notify a change in RSthrough signaling may include designating a downlink BWP, which is theclosest to an uplink BWP from which to measure a path loss or an RS.

The methods for notifying a change in RS may be applied even in asituation in which the carrier frequency of the uplink data channel ischanged. For example, when the carrier frequency of the uplink ordownlink data channel is changed from ƒ₁ to ƒ₂ the method for the basestation to notify a change in RS may be applied to allow the terminal tomeasure a path loss.

Third Embodiment

A method of compensating for a difference between path loss to beestimated in the downlink and uplink path loss when the terminal setsuplink transmission power will be described.

When the terminal measures path loss of the uplink BWP, there may be abig difference between the actual uplink path loss and measured pathloss when the BWP is changed in the uplink, downlink, or both and thedifference under a channel condition between the uplink BWP and thedownlink RS received by the terminal is large. In this regard, tocompensate for the difference, the following methods may be defined:

In a first method of compensating for a difference in path loss, thebase station may measure an offset in path loss between the RS of thedownlink BWP notified to the terminal and the uplink BWP, and notify theterminal of the offset. The terminal may compensate for the differencein path loss by adding the notified offset and calculate a path loss.This is expressed as in Equation (6):PL _(ƒ,c)=referenceSignalPower−RSRP+PL _(off,gNB)  (6)

where PL_(off,gNB): an offset in path loss between downlink BWP measuredand notified by the base station to the terminal and the uplink BWP. Theoffset in path loss may be sent from the base station to the terminalthrough extra signaling. The base station may calculate the offset inpath loss based on other factors including a difference in frequency.

In a second method of compensating for a difference in path loss, theterminal measures an offset in path loss using a difference in frequencybetween downlink BWP RS received by the terminal and the uplink BWP andcompensates for the offset on its own. This is expressed as in Equation(7):PLƒ,c=referenceSignalPower−RSRP+PL _(off,UE)  (7)

where PL_(off,UE): an offset in path loss between an RS of downlink BWPreceived by the terminal and the uplink BWP for transmission. Since theterminal measures and compensates for the offset on its own, measurementis possible without extra signaling from the base station.

In a third method for compensating for a difference in path loss, thebase station measures an RSRP value based on an RS received in theuplink BWP (e.g., sounding reference signal (SRS)) and notifies the RSRPto the terminal. The terminal may calculate path loss by comparing theRSRP value notified from the base station to the power value theterminal sends.

This is expressed as in Equation (8):PL _(ƒ,c)=referenceSignalPower@UE−RSRP@gNB  (8)

where referenceSignalPower@UE RS transmission power sent by the terminalto the base station in a slot for which the base station measures theRSRP, and

RSRP@gNB: a received signal strength measured by the base station basedon the RS sent from the terminal, which may be notified by the basestation to the terminal in extra signaling.

The third method for compensating for a difference in path loss issuitable to an environment having little amount of change in path lossover time. In the environment having little amount of change in pathloss over time, the base station measures RSRP based on the RS of theuplink BWP and notifies it to the terminal. The terminal may thenmeasure the most accurate path loss based on transmitted and receivedsignal strength of the uplink BWP.

The first, second and third methods for compensating for a difference inpath loss may be applied even for a case that the base station measuresthe path loss. In addition, the methods for compensating for adifference in path loss may be applied even in a situation in which thecarrier frequency of the uplink data channel is changed.

FIG. 12 is a diagram of a terminal, according to an embodiment.

Referring to FIG. 12, a terminal may include a transmitter 1204including an uplink transmission processing block 1201, a multiplexer1202, a transmission RF block 1203, a receiver 1208 including a downlinkreception processing block 1205, demultiplexer 1206, and a reception RFblock 1207, and a controller 1209.

The controller 1209 may control the respective element blocks of thereceiver 1208 for receiving a data channel or control channel sent bythe base station and the respective element blocks of the transmitter1204 for transmitting uplink signals by determining whether the terminalreceives BWP and RS change information, whether the terminal receivesreferenceSignalPower information, etc., as described above.

The uplink transmission processing block 1201 of the transmitter 1204 ofthe terminal may generate a signal for transmission by performing aprocess, such as channel coding, modulation, etc. The signal generatedin the uplink transmission processing block 1201 may be multiplexed withanother uplink signal by the multiplexer 1202, subjected to signalprocessing in the transmission RF block 1203, and then sent to the basestation.

The receiver 1208 of the terminal may de-multiplex the signal receivedfrom the base station and distribute the results of de-multiplexing tothe respective downlink reception processing blocks. The downlinkreception processing block 1205 may obtain control information or datasent by the base station by performing a process such as demodulation,channel decoding, and/or the like on the downlink signal from the basestation. The receiver 1208 of the terminal may provide the output resultof the downlink reception processing block 1205 to the controller 1209to support operation of the controller 1209.

FIG. 13 is a diagram of a base station 1300, according to an embodiment.

Referring to FIG. 13, the base station 1300 may include a transceiver1310, a processor 1320, and a memory 1330. According to operation of thebase station as described above in connection with FIGS. 5 to 11, thetransceiver 1310, the processor 1320, and the memory 1330 may operate.The elements of the base station 1300 are not, however, limited thereto.For example, the base station 1300 may include more or fewer elementsthan described above. In addition, in a special occasion, thetransceiver 1310, the processor 1320, and the memory 1330 may beimplemented in a single chip.

The transceiver 1310 may transmit or receive signals to or from aterminal.

The signals may include control information and data. For this, thetransceiver 1310 may include an RF transmitter for up-converting thefrequency of a signal to be transmitted and amplifying the signal and anRF receiver for low-noise amplifying a received signal anddown-converting the frequency of the received signal. This is only anexample, and the elements of the transceiver 1310 are not limited to theRF transmitter and the RF receiver.

In addition, the transceiver 1310 may receive a signal on a wirelesschannel and output the signal to the processor 1320, or transmit asignal output from the processor 1320 on a wireless channel.

The processor 1320 may control a series of processes for the basestation 1300 to operate. For example, the processor 1320 may execute atleast one method of controlling uplink transmission power.

The memory 1330 may store control information or data included in asignal obtained in the base station 1300 and have sectors for storingdata required to control the processor 1320 and data that occurs in thecontrol operation of the processor 1320. The memory 1330 may beimplemented in various forms, such as read only memory (ROM) and/orrandom access memory (RAM) and/or a hard disk and/or a compact disc(CD)-ROM and/or a digital versatile disk (DVD), and/or the like.

The term “module” used herein may represent, for example, a unitincluding one or more combinations of hardware, software and firmware.The term “module” may be interchangeably used with the terms “logic”,“logical block”, “part” and “circuit”. The “module” may be a minimumunit of an integrated part or may be a part thereof. The “module” may bea minimum unit for performing one or more functions or a part thereof.For example, the “module” may include an ASIC.

Various embodiments of the present disclosure may be implemented bysoftware including an instruction stored in a machine-readable storagemedia readable by a machine (e.g., a computer). The machine may be adevice that calls the instruction from the machine-readable storagemedia and operates depending on the called instruction and may includethe electronic device. When the instruction is executed by theprocessor, the processor may perform a function corresponding to theinstruction directly or using other components under the control of theprocessor. The instruction may include a code generated or executed by acompiler or an interpreter. The machine-readable storage media may beprovided in the form of non-transitory storage media, Here, the term“non-transitory”, as used herein, is a limitation of the medium itself(i.e., tangible, not a signal) as opposed to a limitation on datastorage persistency.

The method according to various embodiments disclosed in the presentdisclosure may be provided as a part of a computer program product. Thecomputer program product may be traded between a seller and a buyer as aproduct. The computer program product may be distributed in the form ofmachine-readable storage medium (e.g., a compact disc read only memory(CD-ROM)) or may be distributed only through an application store (e.g.,a Play Store™). In the case of online distribution, at least a portionof the computer program product may be temporarily stored or generatedin a storage medium such as a memory of a manufacturer's server, anapplication store's server, or a relay server.

Each component (e.g., the module or the program) according to variousembodiments may include at least one of the above components, and aportion of the above sub-components may be omitted, or additional othersub-components may be further included. Alternatively or additionally,some components may be integrated in one component and may perform thesame or similar functions performed by each corresponding componentsprior to the integration. Operations performed by a module, aprogramming, or other components according to various embodiments of thepresent disclosure may be executed sequentially, in parallel,repeatedly, or in a heuristic method. Also, at least some operations maybe executed in different sequences, omitted, or other operations may beadded.

While the disclosure has been shown and described with reference tocertain embodiments thereof, it will be understood by those skilled inthe art that various changes in form and details may be made thereinwithout departing from the scope of the disclosure. Therefore, the scopeof the disclosure should not be defined as being limited to theembodiments, but should be defined by the appended claims andequivalents thereof.

What is claimed is:
 1. A method, performed by a terminal, oftransmitting and receiving a signal in a wireless communication system,the method comprising: receiving cell information indicating a servingcell via a radio resource control (RRC) signaling for a physical uplinkcontrol channel (PUCCH); receiving a reference signal (RS) on abandwidth part (BWP) of the serving cell based on the received cellinformation; identifying path loss information based on the RS receivedon the BWP of the serving cell; and controlling a transmission power ofthe PUCCH based on the path loss information.
 2. The method of claim 1,wherein the BWP of the serving cell is indicated by a physical layersignaling.
 3. The method of claim 1, wherein the BWP is an activedownlink (DL) BWP, and wherein the active DL BWP is identified based oncontrol information of a physical layer signaling.
 4. The method ofclaim 1, further comprising: receiving an indication for indicating achange of the BWP and a change of the RS, wherein the changed BWP andthe changed RS are identified based on system information received viathe RRC signaling.
 5. A method, performed by a base station (BS), oftransmitting and receiving a signal in a wireless communication system,the method comprising: transmitting cell information indicating aserving cell via a radio resource control (RRC) signaling for a physicaluplink control channel (PUCCH); identifying a bandwidth part (BWP) ofthe serving cell corresponding to the cell information; and transmittinga reference signal (RS) on the BWP of the serving cell, wherein pathloss information is identified based on the RS on the BWP of the servingcell, and wherein a transmission power of the PUCCH is controlled basedon the path loss information.
 6. The method of claim 5, wherein the BWPof the serving cell is indicated by a physical layer signaling.
 7. Themethod of claim 5, wherein the BWP is an active downlink (DL) BWP, andwherein the active DL BWP is identified based on control information ofa physical layer signaling.
 8. The method of claim 5, furthercomprising: transmitting indication for indicating a change of the BWPand a change of the RS, wherein the changed BWP and the changed RS areidentified based on system information received via the RRC signaling.9. A terminal for transmitting and receiving a signal in a wirelesscommunication system, the terminal comprising: a transceiver; and atleast one processor coupled with the transceiver and configured to:control the transceiver to receive cell information indicating a servingcell via a radio resource control (RRC) signaling for a physical uplinkcontrol channel (PUCCH), control the transceiver to receive a referencesignal (RS) on a bandwidth part (BWP) of the serving cell based on thereceived cell information, identify path loss information based on theRS received on the BWP of the serving cell, and control a transmissionpower of the PUCCH based on the path loss information.
 10. The terminalof claim 9, wherein the BWP of the serving cell is indicated by aphysical layer signaling.
 11. The terminal of claim 9, wherein the BWPis an active downlink (DL) BWP, and wherein the active DL BWP isidentified based on control information of a physical layer signaling.12. The terminal of claim 9, wherein the at least one processor isfurther configured to: control the transceiver to receive an indicationfor indicating a change of the BWP and a change of the RS, wherein thechanged BWP and the changed RS are identified based on systeminformation received via the RRC signaling, and indicate a power of theRS, wherein the path loss information is identified based on an RSparameter and the RS on the BWP of the serving cell.
 13. A base station(BS) for transmitting and receiving a signal in a wireless communicationsystem, the BS comprising: a transceiver; and at least one processorcoupled with the transceiver and configured to: control the transceiverto transmit cell information indicating a serving cell via a radioresource control (RRC) signaling for a physical uplink control channel(PUCCH), identify a bandwidth part (BWP) of the serving cellcorresponding to the cell information, and control the transceiver totransmit a reference signal (RS) on the BWP of the serving cell, whereinpath loss information is identified based on the RS on the BWP of theserving cell, and wherein a transmission power of the PUCCH iscontrolled based on the path loss information.
 14. The BS of claim 13,wherein the BWP of the serving cell is indicated by a physical layersignaling.
 15. The BS of claim 13, wherein the BWP is an active downlink(DL) BWP, and wherein the active DL BWP is identified based on controlinformation of a physical layer signaling.
 16. The BS of claim 13,wherein the at least one processor is further configured to control thetransceiver to transmit an indication for indicating a change of the BWPand a change of the RS, and wherein the changed BWP and the changed RSare identified based on system information received via the RRCsignaling.